Oral irrigator



FIG. 1 is a perspective view of an oral irrigator showing the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a left side view thereof.

The broken lines in the drawings illustrate portions of the oral irrigator that form no part of the claimed design. 

CLAIM The ornamental design for an oral irrigator, as shown and described. 